CN109263038B

CN109263038B - Spread powder formula 3D printer

Info

Publication number: CN109263038B
Application number: CN201810782473.XA
Authority: CN
Inventors: 赵弘; 黄旭; 赵毅鑫; 张毅然; 张岩
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 2018-07-17
Filing date: 2018-07-17
Publication date: 2020-01-17
Anticipated expiration: 2038-07-17
Also published as: CN109263038A

Abstract

The application provides a spread powder formula 3D printer includes: the liquid spraying device comprises a fluid barrel, a nozzle frame and a nozzle, wherein the nozzle frame is slidably mounted on the printer body, the nozzle is mounted on the nozzle frame, an overflowing channel is formed in the nozzle, the overflowing channel is provided with an inlet and an outlet, the inlet is connected with the fluid barrel, and the outlet is provided with a nozzle; the overflowing channel is movably provided with a blocking piece, the blocking piece conducts the inlet and the outlet when moving to a first target position relative to the overflowing channel, and the blocking piece disconnects the inlet and the outlet when moving to a second target position relative to the overflowing channel; one side of the blocking piece, which is far away from the inlet, is provided with an elastic piece, and the elastic piece is used for pushing the blocking piece so as to enable the blocking piece to move from the first target position to the second target position. By adopting the powder spreading type 3D printer, the outflow of fluid can be accurately controlled, the accuracy of liquid spraying in the powder spreading process is realized, and the printing accuracy of the printer is further improved.

Description

Spread powder formula 3D printer

Technical Field

The invention relates to the technical field of 3D printing, in particular to a powder laying type 3D printer.

Background

With the rapid development of 3D printing technology, 3D printers have been able to print a variety of printing materials, such as rock-like materials, to meet the applications in different fields. At present, the powder spreading type 3D printer can be used for printing rock-like materials so as to carry out simulation experiment research on the printed 3D model. The liquid spraying precision of the liquid spraying device in the powder spreading type 3D printer has a great influence on the precision of the printed 3D model, so that the liquid spraying device is generally improved in the prior art to improve the printing precision of the powder spreading type 3D printer.

In the prior art, a liquid spraying device of a powder-spreading type 3D printer comprises a spray head, a fluid conveying pipe, a pump and a fluid barrel, wherein a flow passage is formed in the spray head, and the flow passage has an inlet and an outlet; the inlet end of the pump is connected to the fluid barrel, the outlet end of the pump is connected to the first end of the fluid delivery tube, and the second end of the fluid delivery tube is connected to the inlet. When the liquid spraying device sprays liquid, the pump pumps the fluid in the fluid barrel into the first end of the fluid conveying pipe, then the fluid flows into the inlet through the second end of the fluid conveying pipe and then enters the overflowing channel, and finally the fluid is sprayed out through the outlet and is sprayed onto a material to be printed so as to realize the tight adhesion between adjacent printing layers in a 3D printing product; when the fluid is not required to be pumped, the pump is turned off and the pumping of the fluid into the fluid delivery pipe is stopped.

In the existing liquid spraying device, after a pump is turned off, the pump does not pump fluid into a fluid conveying pipe any more, however, fluid is still left in the fluid conveying pipe and a spray head, and the fluid in the fluid conveying pipe enters an inlet of the spray head due to the action of inertia, so that the fluid in an overflowing channel is sprayed from the spray head to a material to be printed due to the accumulation of a large amount of fluid, and the accuracy of a printed 3D model is low.

Disclosure of Invention

The application provides a spread powder formula 3D printer to when solving among the prior art spread powder formula 3D printer and print materials such as class rock the lower problem of precision.

A powder-laying 3D printer comprising: the liquid spraying device comprises a fluid barrel, a sprayer frame and a sprayer, wherein the sprayer frame is slidably mounted on the printer body, the sprayer is mounted on the sprayer frame, an overflowing channel is formed in the sprayer, the overflowing channel is provided with an inlet and an outlet, the inlet is connected with the fluid barrel, and the outlet is provided with a nozzle; the overflowing channel is movably provided with a blocking part, the blocking part conducts the inlet and the outlet when moving to a first target position relative to the overflowing channel, and the blocking part disconnects the inlet and the outlet when moving to a second target position relative to the overflowing channel; and one side of the blocking piece, which is far away from the inlet, is provided with an elastic piece, and the elastic piece is used for pushing the blocking piece so as to enable the blocking piece to move from a first target position to a second target position.

Further, the liquid ejection apparatus further includes: first fluid conveyer pipe, second fluid conveyer pipe and third fluid conveyer pipe, first fluid conveyer pipe with the shower nozzle is connected, third fluid conveyer pipe with the fluid bucket is connected, the both ends of second fluid conveyer pipe respectively with first fluid conveyer pipe, the articulated and intercommunication of third fluid conveyer pipe, so that the shower nozzle can slide on the printer main part.

Further, the second fluid conveying pipe is hinged with the first fluid conveying pipe through a rotary joint; the rotary joint comprises a fixed shaft, an inner cavity is arranged in the fixed shaft, and a plurality of flow guide holes communicated with the inner cavity are uniformly formed in the fixed shaft; two sliding sleeves are rotatably sleeved on the fixed shaft, wherein one sliding sleeve is communicated with the second fluid conveying pipe, and the other sliding sleeve is communicated with the first fluid conveying pipe; the sliding sleeve is provided with a sliding sleeve hole, one of the first fluid conveying pipe and the second fluid conveying pipe is arranged in the sliding sleeve hole, and when the sliding sleeve rotates to the sliding sleeve hole and is communicated with at least one flow guide hole in the fixed shaft, the sliding sleeve is communicated with the fixed shaft.

Further, a pump is disposed between the third fluid delivery tube and the fluid drum to power the flow of fluid in the fluid drum to the third fluid delivery tube; a reversing valve is arranged in the third fluid conveying pipe, the reversing valve is connected with a safety valve, the safety valve is connected with the fluid barrel, and the safety valve is used for introducing the return fluid in the third fluid conveying pipe into the fluid barrel.

Further, the printer main body includes: the power assembly comprises a first Y-direction transmission belt, a second Y-direction transmission belt, an X-direction transmission belt, a first driving piece and a second driving piece; the first Y-direction transmission belt and the second Y-direction transmission belt are arranged on the bracket in parallel; the first Y-direction transmission belt comprises a first end and a second end which are opposite, and the second Y-direction transmission belt comprises a third end and a fourth end which are opposite; the first end is connected with the third end through a first rotating shaft, the first rotating shaft is connected with the first driving piece, and the second end is connected with the fourth end through a second rotating shaft; the two ends of the X-direction transmission belt are respectively arranged on the first Y-direction transmission belt and the second Y-direction transmission belt, and the spray head frame is arranged on the X-direction transmission belt in a lapping manner so that the X-direction transmission belt can drive the spray head frame to move in the Y direction; the second driving piece drives the X-direction transmission belt to move, so that the X-direction transmission belt moves in the X direction.

Furthermore, the support includes four bracing pieces, four the upper end of bracing piece all has the telescopic cylinder, its two cylinders with first rotation axis is connected, two other cylinders with the second rotation axis links to each other to through the cylinder drives first Y direction drive belt and second Y direction drive belt up-and-down motion.

Further, the printing and forming device also comprises a printing and forming part, wherein the printing and forming part comprises a shell, and the shell is fixed on the bracket; the shell is provided with an inner space, a partition wall is arranged in the inner space, the partition wall divides the inner space of the shell into a forming cavity and a powder storage cavity, and the forming cavity and the powder storage cavity are provided with lower end openings; the powder storage device is characterized in that electric push rods are arranged below the forming cavity and the powder storage cavity respectively, the output ends of the electric push rods are arranged in corresponding lower end openings in a penetrating mode respectively, piston plates are connected to the output ends of the electric push rods and located in the forming cavity and the powder storage cavity respectively, and the piston plates are driven to move up and down through the electric push rods.

Further, the shell comprises oppositely arranged side walls and end walls connected with the side walls, and two ends of the side walls extend out of the end walls; the printing forming part also comprises a recovery body, and the recovery body, the side wall extending out of the end wall and the end wall enclose a recovery cavity with an upper end opening; the recovery body is slidably disposed on the sidewall.

The powder spreading device is arranged on the first Y-direction transmission belt and the second Y-direction transmission belt; the powder spreading device comprises a powder spreading roller and a scraper, and the scraper is positioned on one side, facing the forming cavity, of the powder spreading roller; the scraper blade be equipped with spread powder roller complex cambered surface, the scraper blade pass through the cambered surface with spread powder roller normal running fit.

Furthermore, the powder spreading device also comprises a fixed frame, the fixed frame is arranged on the first Y-direction transmission belt and the second Y-direction transmission belt, the powder spreading roller is rotatably arranged on the fixed frame, and the scraper is fixedly connected with the fixed frame; and/or the scraper comprises a first fixing plate extending along the axial direction of the powder spreading roller, one side of the first fixing plate, facing the powder spreading roller, is provided with a first flanging edge, and one side of the first flanging edge, facing the powder spreading roller, is provided with the cambered surface so as to be matched with the powder spreading roller; the first fixing plate is fixed with the curb plate along spread the both ends of whitewashed roller axial extension, the curb plate is to keeping away from spread the extension of one side of whitewashed roller, just the lower terminal surface of curb plate is higher than the cambered surface.

According to the powder-spreading type 3D printer, the liquid spraying device comprising the fluid barrel, the spray head frame and the spray head is arranged, the spray head frame is slidably arranged on the printer body, and the spray head is arranged on the spray head frame, so that the spray head can spray liquid at different positions; the overflowing channel is formed in the spray head, the blocking piece is arranged in the overflowing channel, so that the blocking piece can move to a first target position relative to the overflowing channel and conduct the inlet and the outlet, meanwhile, the elastic piece is arranged in the overflowing channel, and the elastic piece can push the blocking piece to a second target position from the first target position and disconnect the inlet and the outlet. By adopting the powder spreading type 3D printer, the outflow of fluid can be accurately controlled, the accuracy of liquid spraying in the powder spreading process is realized, and the printing accuracy of the printer is further improved; meanwhile, the device can block the inflow of fluid under the action of the blocking piece and the elastic piece, and is convenient for stable delivery of the fluid in the overflowing channel.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a front view of a powder-laying 3D printer in an embodiment of the invention;

FIG. 2 is a left side view of the powder-laying 3D printer in an embodiment of the invention;

FIG. 3 is a top view of a powder-laying 3D printer according to an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a nozzle holder according to an embodiment of the present invention;

FIG. 5 is a schematic view of an exemplary showerhead;

FIG. 6 is a schematic view of a rotary joint structure according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a rotary union in accordance with an embodiment of the present invention;

FIG. 8 is a cross-sectional view of yet another swivel joint in an embodiment of the present invention;

FIG. 9 is a cross-sectional view of yet another rotary union in an embodiment of the present invention;

FIG. 10 is a schematic view of the connection between the diverter valve and the relief valve in accordance with an embodiment of the present invention;

FIG. 11 is a schematic structural view of a power assembly according to an embodiment of the present invention;

FIG. 12 is a first schematic view of a printing portion according to an embodiment of the present invention;

FIG. 13 is a second schematic structural view of a printing and molding portion according to an embodiment of the present invention;

FIG. 14 is a schematic view of the connection between the electric push rod and the piston plate according to an embodiment of the present invention;

FIG. 15 is a schematic structural view of an electric putter according to an embodiment of the present invention;

FIG. 16 is a schematic view of the connection between the powder spreading device and the power assembly according to an embodiment of the present invention;

FIG. 17 is a schematic structural view of a powder spreading device according to an embodiment of the present invention;

FIG. 18 is a schematic view of the construction of a dusting roller in an embodiment of the present invention;

FIG. 19 is a front view of a squeegee according to an embodiment of the invention;

FIG. 20 is a left side view of a squeegee according to an embodiment of the invention;

FIG. 21 is a top view of a squeegee in accordance with an embodiment of the invention.

Reference numerals:

1-powder laying type 3D printer;

100-a fluid bucket;

200-a nozzle holder; 210-a first mounting plate; 220-a second mounting plate; 221-mounting plate through holes; 230-a third mounting plate;

300-a spray head; 310-a nozzle; 320-a barrier; 330-an elastic member;

410-a first liquid delivery tube; 411-a first rigid tube; 412-a second rigid tube; 420-a second liquid delivery pipe; 430-a third liquid delivery tube; 431-a third rigid tube; 432-a fourth rigid tube;

500-a rotary joint; 510-a fixed shaft; 511-diversion holes; 512-a first bump; 513 — a first via; 514-a second via; 515-a second protrusion; 520-a sliding sleeve; 521-a sliding sleeve hole;

610-a pump; 620-a reversing valve; 630-safety valve; 621-first port; 622-second port; 623-a third port; 624-fourth port; 640-a tee joint;

710-a first Y-direction drive belt; 720-second Y-direction drive belt; 730-X direction belt; 740 — a first driving member; 750-a second driving member; 760-a first axis of rotation; 770-a second rotational axis; 780-a mounting frame;

810-support rods; 820-a cylinder; 830-a dividing wall; 831-side wall; 832-end wall; 840-electric push rod; 850-piston plate; 860-a coupling;

910-powder spreading roller; 911-rotating shaft; 920-a scraper plate; 921 — a first fixing plate; 922-a first flanging; 923-convex; 924-side plate; 930-a fixing frame; 931-bearings; 932 — a stepper motor.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

A powder-laying 3D printer according to the present application is described below with reference to fig. 1-5. As shown in fig. 1 to 5, a powder-laying type 3D printer 1 includes: the liquid spraying device comprises a fluid barrel 100, a nozzle frame 200 and a nozzle 300, wherein the nozzle frame 200 is slidably mounted on the printer body, the nozzle 300 is mounted on the nozzle frame 200, an overflowing channel is formed in the nozzle 300, the overflowing channel is provided with an inlet and an outlet, the inlet is connected with the fluid barrel 100, and the outlet is provided with a nozzle 310; the overflowing channel is movably provided with a blocking part 320, the inlet and the outlet are communicated when the blocking part 320 moves to a first target position relative to the overflowing channel, and the inlet and the outlet are disconnected when the blocking part 320 moves to a second target position relative to the overflowing channel; the elastic member 330 is disposed on a side of the blocking member 320 facing away from the inlet, and the elastic member 330 is used for pushing the blocking member 320, so that the blocking member 320 moves from the first target position to the second target position.

Specifically, the fluid barrel 100 may be a cylinder with an internal cavity, such as a cylinder with a circular or rectangular cross section, and is not limited specifically herein, as long as the fluid can be contained, and the fluid here may be a glue solution, or water, and is specifically set according to actual needs.

The nozzle holder 200 may include a first mounting plate 210, a second mounting plate 220, and a third mounting plate 230, wherein the second mounting plate 220 and the third mounting plate 230 are oppositely disposed at both ends of the first mounting plate 210, and the second mounting plate 220 and the third mounting plate 230 each extend toward a lower end of the first mounting plate 210, so that the first mounting plate 210 is slidably mounted on the printer body. The first mounting plate 210, the second mounting plate 220, and the third mounting plate 230 may be rectangular plates. Optionally, the first mounting plate 210, the second mounting plate 220, and the third mounting plate 230 may be integrally formed, or may be fixedly connected by welding. Optionally, the nozzle holder 200 may be made of 45 # steel, which not only reduces the cost, but also meets the requirements of strength and rigidity required by machining.

Showerhead 300 may be a cylinder, such as rectangular or circular in cross-section. The present embodiment and the following embodiments are described by taking the showerhead 300 as a rectangular column. The inside of the spray head 300 is formed with a flow passage having an inlet port, which may be provided on a first sidewall of the spray head 300, and an outlet port, which may be provided on a second sidewall connected to the first sidewall, and which is disposed in parallel with the first mounting plate 210. Optionally, the flow passage may be an L-shaped structure, and it can be understood that the flow passage includes a transverse flow passage and a longitudinal flow passage, a first end of the transverse flow passage is an inlet of the flow passage, a second end of the transverse flow passage is connected to a first end of the longitudinal flow passage, and a second end of the longitudinal flow passage is an outlet of the flow passage. The cross sections of the transverse flow channels and the longitudinal flow channels of the flow passage channel can be circular. Alternatively, the inlet of the overflow channel may be connected to the fluid bucket 100 by a hose or a hard pipe.

The flow passage is movably provided with a blocking member 320, and optionally, the blocking member 320 may be a circular plate, and the outer circumference of the blocking member 320 is matched with the inner circumference of the flow passage so as to block the fluid flowing from the inlet of the flow passage. The side of the blocking member 320 facing away from the inlet is provided with a resilient member 330, one end of the resilient member 330 may be fixed to an end wall of the second end of the transverse flow passage opposite to the inlet, and the other end of the resilient member 330 is fixedly connected to the blocking member 320. The elastic member 330 may be a telescopic spring.

Optionally, a fluid partition plate 340 with a plurality of through holes may be disposed at a connection between the second end of the transverse flow channel and the first end of the longitudinal flow channel in the flow passage, and the fluid partition plate 340 may be a circular plate to be adapted to the pipe diameter of the longitudinal flow channel.

When fluid enters the inlet of the flow passage, the pressure of the fluid pushes the blocking member 320 to move to a first target position to the side away from the inlet, the elastic member 330 is in a contracted state, the inlet is communicated with the outlet, the first target position refers to that the blocking member 320 is pushed to the fluid partition plate 340 at the second end of the transverse flow passage, and the fluid can flow into the longitudinal flow passage from the transverse flow passage through the through hole on the fluid partition plate 340; when the fluid delivery is stopped, the pressure of the fluid in the transverse flow passage is not enough to resist the resilience of the elastic member 31, the elastic member 330 pushes the blocking member 320 to the second target position by the resilience, the inlet is disconnected from the outlet, and the second target position refers to the situation where the blocking member 320 is pushed into the transverse flow passage by the elastic member 330, and the fluid cannot flow into the longitudinal flow passage from the transverse flow passage.

The nozzle 300 is mounted on the nozzle holder 200, optionally, the nozzle 300 may be fastened to the nozzle holder 200 by bolts and nuts, for example, a first side wall of the nozzle 300 and a side wall opposite to the first side wall are respectively attached to the second mounting plate 220 and the third mounting plate 230 of the nozzle holder 200, the second mounting plate 220 and the third mounting plate 230 are respectively provided with a first through hole and a second through hole, a third through hole is provided at a corresponding position of the nozzle 300, and the bolts sequentially pass through the first through hole, the third through hole, and the second through hole and then are fastened to the nuts, so that the nozzle 300 is fixed to the nozzle holder 200. Wherein, the second mounting plate 220 of the spray head frame 200 is provided with a mounting plate through hole 221, and the mounting plate through hole 221 is communicated with the inlet on the first sidewall of the spray head 300, so that the fluid in the fluid container 100 flows into the flow passage of the spray head 300.

The nozzle 310 may be a cone formed with a through hole to facilitate fluid ejection in the nozzle 310. The nozzle 310 may be made of metal or plastic having heat resistance. Wherein the nozzle 310 is installed at the outlet of the spray head 300, optionally, the nozzle 310 may be connected with the spray head 300 through a threaded connection, for example, the inlet end of the nozzle 310 is provided with an external thread, the outlet of the spray head 300 is provided with an internal thread, and the inlet end of the nozzle 310 is matched with the outlet of the spray head 300 to realize the connection between the nozzle 310 and the spray head 300, and at the same time, to facilitate the fluid to be sprayed out of the nozzle 310.

With the powder spreading type 3D printer provided in this embodiment, when liquid is required to be sprayed, a power element such as a pump pumps fluid from the fluid barrel 100 into the inlet of the spray head 300 and then into the fluid channel, the fluid flows from the inlet to the outlet of the fluid channel with a certain pressure, the fluid with a certain pressure pushes the blocking member 320 to press the elastic member 330 to move to a side away from the inlet, when the blocking member 320 moves to the first target position, the inlet and the outlet are conducted, the fluid enters the nozzle 310 through the outlet, and the nozzle 310 sprays the fluid; when the supply of fluid to the inlet is stopped, i.e. the fluid is no longer pressurized, the fluid remaining in the fluid channel is not enough to resist the resilience of the elastic member 330, the elastic member 330 pushes the blocking member 320 from the first target position to the second target position under the resilience, the inlet is disconnected from the outlet, and the jet flow in the nozzle 310 is no longer performed.

According to the powder-spreading type 3D printer provided by the embodiment, the liquid spraying device comprising the fluid barrel 1, the nozzle frame 2 and the spray head 3 is arranged, the nozzle frame 2 is slidably mounted on the printer body, and the spray head is mounted on the nozzle frame 2, so that the spray head 3 can spray liquid at different positions; by forming the flow passage in the head, the blocking member 31 is disposed in the multi-flow passage, so that the blocking member 31 can move to a first target position relative to the flow passage and conduct the inlet and the outlet, and at the same time, the elastic member 32 is installed in the flow passage, and the elastic member 32 can push the blocking member 31 from the first target position to a second target position and disconnect the inlet and the outlet. By adopting the powder spreading type 3D printer, the outflow of fluid can be accurately controlled, the accuracy of liquid spraying in the powder spreading process is realized, and the printing accuracy of the printer is further improved; meanwhile, the device can block the inflow of fluid under the action of the blocking piece 31 and the elastic piece 32, and is convenient for stable conveying of the fluid in the flow passage.

Further, the liquid ejection apparatus further includes: the printer comprises a first fluid delivery pipe 410, a second fluid delivery pipe 420 and a third fluid delivery pipe 430, wherein the first fluid delivery pipe 410 is connected with the spray head 300, the third fluid delivery pipe 430 is connected with the fluid barrel 100, and two ends of the second fluid delivery pipe 420 are respectively hinged and communicated with the first fluid delivery pipe 410 and the third fluid delivery pipe 430, so that the spray head can slide on the printer body.

Specifically, the liquid ejecting apparatus further includes a plurality of fluid delivery pipes, and optionally, the plurality of fluid delivery pipes are rigid pipes, and two of the plurality of fluid delivery pipes are rotatably connected to each other, so that the fluid delivery pipes can deliver the fluid to the head 300 by adjusting the delivery path when the head cartridge 200 moves on the printer body.

Wherein the first fluid delivery tube 410 comprises a first rigid tube 411 and a second rigid tube 412, a second end of the first rigid tube 411 is hinged to a first end of the second rigid tube 412, a first end of the first rigid tube 411 is connected to the inlet of the injector head 300, and a second end of the second rigid tube 412 is hinged to the second fluid delivery tube 420; optionally, the second end of the first rigid pipe 411 and the first end of the second rigid pipe 412 move in the same direction, and it can be understood that the nozzle 300 drives the first end of the first rigid pipe 411 to move along the X direction, and the first rigid pipe 411 rotates while moving along the X direction to drive the second rigid pipe 412 to rotate, so as to implement the follow-up transmission of the first rigid pipe 411 and the second rigid pipe 412 in the X direction. Alternatively, the first end of the first rigid tube 411 may be hinged to the second end of another rigid tube, which is connected to the inlet of the nozzle 300, wherein the second end of the other rigid tube may be connected to the first end of the first rigid tube 411 by a swivel joint as shown in fig. 8 or 9, and the swivel joint therebetween is fixed to the nozzle holder.

The third fluid delivery tube 430 comprises a third rigid tube 431 and a fourth rigid tube 432, the first end of the third rigid tube 431 is hinged to the second fluid delivery tube 420, the second end of the third rigid tube 431 is hinged to the first end of the fourth rigid tube, and the second end of the fourth rigid tube 432 is connected to the fluid barrel; alternatively, the third rigid pipe 431 and the fourth rigid pipe 432 can move in the same direction, and it can be understood that the X-direction transmission belt drives the third rigid pipe 431 to move along the Y direction, and the third rigid pipe 431 rotates while moving along the Y direction to drive the fourth rigid pipe 432 to rotate, so that the follow-up transmission of the third rigid pipe 431 and the fourth rigid pipe 432 in the Y direction is realized. Alternatively, the second end of the fourth rigid tube may be hingedly connected to the second end of the other rigid tube, the first end of the other rigid tube being connected to the fluid drum. Optionally, the first fluid delivery pipe 410 can move in the X direction so as to cooperate with the movement of the spray head in the X direction, the axis of the second fluid delivery pipe 420 is parallel to the X direction, and the second fluid delivery pipe 420 can be fixed on one side of the X direction transmission belt; the third fluid delivery tube 410 is movable in the Y direction to cooperate with the Y direction movement of the spray head.

The first fluid delivery tube 410, the second fluid delivery tube 420, and the third fluid delivery tube 430 may be selected to be rigid tubes to enhance the stability of the glue delivery; optionally, the outer diameters of the first fluid delivery tube 410, the second fluid delivery tube 420, and the third fluid delivery tube 430 may be set according to actual requirements, for example, the outer diameters of the first fluid delivery tube 410, the second fluid delivery tube 420, and the third fluid delivery tube 430 may be all 5mm, but are not limited thereto, and the outer diameters may be specifically set according to actual requirements.

Optionally, when the first fluid delivery pipe 410 is connected to the spray head 300, one end of the first fluid delivery pipe 410 may be connected to an inlet of the spray head 300, for example, one end of the first fluid delivery pipe 410 is provided with an external thread, an inlet of the spray head 300 is provided with an internal thread, the first fluid delivery pipe 410 is connected to the spray head 300 through a rotary joint as shown in fig. 8, so that one end of the first fluid delivery pipe 410 is matched with the inlet of the spray head 300, and an O-shaped rubber ring is disposed at one end of the first fluid delivery pipe 410 and the inlet of the spray head 300, so as to facilitate the sealing and matching between the two and avoid the leakage of the fluid.

Alternatively, when the third fluid delivery tube 430 is connected to the fluid container 100, one end of the third fluid delivery tube 430 may be connected to the fluid container 100, for example, a first threaded hole with an internal thread is formed at the lower end of the fluid container 100, an external thread is formed at one end of the third fluid delivery tube 430, the third fluid delivery tube 430 is connected to the fluid container 100 through a rotary joint as shown in fig. 9, so that one end of the third fluid delivery tube 430 is engaged with the fluid container 100, and an O-ring is disposed between one end of the third fluid delivery tube 430 and the first threaded hole of the fluid container 100, so as to facilitate a sealing engagement therebetween and prevent fluid leakage.

The two ends of the second fluid delivery tube 420 are respectively hinged and communicated with the first fluid delivery tube 410 and the third fluid delivery tube 430, so that the first rigid tube 411 of the first fluid delivery tube 410 can move in the X direction relative to the second fluid delivery tube 420, and meanwhile, the first fluid delivery tube 410 can move in the Y direction together with the second fluid delivery tube 420, and simultaneously, the fluid is ensured to flow into the injector head 300 through the third fluid delivery tube 430, the second fluid delivery tube 420 and the first fluid delivery tube 410 in sequence.

With the powder spreading type 3D printer provided in this embodiment, after the fluid flows into the third fluid delivery tube 430 from the fluid barrel 100, the fluid flows into the second fluid delivery tube 420 and the first fluid delivery tube 410 in sequence and then flows into the inlet of the spray head 300, so as to achieve the conduction from the fluid barrel 100 to the inlet of the spray head 300.

According to the powder spreading type 3D printer provided by the embodiment, the first fluid delivery pipe 410, the second fluid delivery pipe 420 and the third fluid delivery pipe 430 are arranged between the fluid barrel 100 and the inlet of the spray head 300, and two ends of the second fluid delivery pipe 420 are hinged and communicated with the first fluid delivery pipe 410 and the third fluid delivery pipe 430 respectively, so that stable fluid transmission is facilitated, and continuous fluid transmission is realized.

Further, the second fluid delivery pipe 420 is hinged with the first fluid delivery pipe 410 through a rotary joint 500; the rotary joint 500 comprises a fixed shaft 510, an inner cavity is arranged inside the fixed shaft 510, and a plurality of flow guide holes 511 communicated with the inner cavity are uniformly arranged on the fixed shaft 510; two sliding sleeves 520 are rotatably sleeved on the fixed shaft 510, wherein one sliding sleeve 520 is communicated with the second fluid delivery pipe 420, and the other sliding sleeve 520 is communicated with the first fluid delivery pipe 410; the sliding sleeve 520 is provided with a sliding sleeve hole 521, one of the first fluid delivery pipe 410 and the second fluid delivery pipe 420 is installed in the sliding sleeve hole 521, and when the sliding sleeve 520 rotates until the sliding sleeve hole 521 is communicated with at least one diversion hole 511 on the fixed shaft 510, the sliding sleeve 520 is communicated with the fixed shaft 510.

Specifically, as shown in fig. 6 and 7, the fixed shaft 510 may be a cylinder, and an inner cavity for passing a fluid is provided inside the cylinder, so as to facilitate stable transmission of the fluid between the fluid bucket 100 and the spray head 300. Optionally, the fixing shaft 510 may be made of 45 # steel, or may be made of aluminum alloy, and is not limited specifically herein. The fixed shaft 510 is uniformly provided with a plurality of guiding holes 511, the guiding holes 511 can be uniformly arranged on the outer circumference of the fixed shaft 510, and the guiding holes 511 are communicated with the inner cavity.

The sliding sleeve 520 is an annular tubular structure, optionally, one end of the sliding sleeve 520 may be provided with a positioning shoulder extending in the axial direction of the sliding sleeve 520, and the other end of the sliding sleeve 520 is provided with a plug to limit the axial movement of the sliding sleeve 520 on the fixed shaft 510, so that the sliding sleeve 520 can only rotate on the fixed shaft 510 and cannot move along the axial direction of the fixed shaft 510; optionally, a sealing ring is installed at a position where the fixed shaft 510 is in running fit with the sliding sleeve, so that the sealing performance of the sliding sleeve in the rotating process is realized. Wherein, the outer circumference of the sliding sleeve 520 is provided with a sliding sleeve hole 521, and the sliding sleeve hole 521 penetrates through the side wall forming the outer circumference of the sliding sleeve 520.

The fixed shaft 510 is sleeved with two sliding sleeves 520, optionally, the two sliding sleeves 520 are rotatably sleeved on the outer circumference of the fixed shaft 510, and the flow guide holes 511 of the fixed shaft 510 are respectively located at the matching positions of the two sliding sleeves 520 and the outer circumference of the fixed shaft 510, so that the sliding sleeve holes 521 of the sliding sleeves 520 are communicated with the flow guide holes 511. Optionally, the sliding sleeve 520 is connected to the fixed shaft 510 at two ends in a sealing manner to prevent fluid from flowing out.

One of the two sliding sleeves 520 is connected to the second fluid delivery tube 420 through a sliding sleeve aperture 521, and the other sliding sleeve 520 is connected to the first fluid delivery tube 410 through a sliding sleeve aperture 521, it being understood that the second rigid tube 412 of the first fluid delivery tube 410 is connected to the second fluid delivery tube 420 through a swivel joint to facilitate adjustment of the fluid delivery lines by sliding the head frame 200 on the printer body. Alternatively, when the second rigid pipe 412 is connected to the second fluid delivery pipe 420 by a rotary joint, the sliding sleeve connected to the second rigid pipe 412 may be rotated with respect to the fixed shaft, and another sliding sleeve connected to the second fluid delivery pipe is fixed to the mounting frame, so that another sliding sleeve connected to the second fluid delivery pipe cannot be rotated, and the rotary joint may be a structure as shown in fig. 7 or 9. Wherein the first and second rigid tubes of the first fluid delivery tube 410 are connected by a swivel joint, such as the swivel joint shown in fig. 7, and the third and fourth rigid tubes of the third fluid delivery tube 430 are connected by a swivel joint, such as the swivel joint shown in fig. 7.

Alternatively, the third rigid pipe of the third fluid delivery pipe 430 and the second fluid delivery pipe may be connected by a first rotary joint as shown in fig. 8, the first rotary joint includes a fixed shaft 510, a sliding sleeve 520, the sliding sleeve 520 is rotatably sleeved on the outer circumference of the fixed shaft 510, and the guiding hole 511 of the fixed shaft 510 is located at the matching position of the sliding sleeve 520 and the outer circumference of the fixed shaft 510, so that the sliding sleeve hole 521 of the sliding sleeve 520 is communicated with the guiding hole 511. One end of the fixed shaft 510 departing from the sliding sleeve is provided with a first protrusion 512, the first protrusion 512 is provided with a first through hole 513, the first protrusion 512 of the fixed shaft 510 is inserted into the second end of the second fluid delivery pipe, and a sliding sleeve hole of the sliding sleeve 520 sleeved on the fixed shaft 510 is connected with the third fluid delivery pipe, so that the second fluid delivery pipe is communicated with the third fluid delivery pipe 430, and the follow-up transmission of the third fluid delivery pipe in the Y direction is facilitated.

Optionally, the first fluid delivery pipe 410 and the second fluid delivery pipe may be connected by a second rotating joint as shown in fig. 9, the second rotating joint includes a fixed shaft 510 and a sliding sleeve 520, the fixed shaft is provided with a second protrusion 515 of the second through hole 514, an axis of the second through hole 514 is perpendicular to an axis of the fixed shaft, so that the second protrusion is connected with one side of the second fluid delivery pipe facing the first fluid delivery pipe 410, a structure of the sliding sleeve 520 is the same as that of the rotating joint, which is not described herein again, wherein a sliding sleeve hole of the sliding sleeve 520 is communicated with the first fluid delivery pipe 410, so as to facilitate the follow-up transmission of the first fluid delivery pipe in the X direction.

With the powder spreading type 3D printer provided in this embodiment, when the fluid flows into the sliding sleeve 520 through the sliding sleeve hole 521 and enters the inner cavity of the fixed shaft 510 through the guiding hole 511 from the third fluid delivery pipe 430, the fluid in the inner cavity flows out to the first protrusion 512 through the guiding hole 511, and finally flows into the second fluid delivery pipe 420 through the first through hole 513 in the first protrusion 512, and then the fluid continues to flow, and flows into the rotary joint 500 from the second fluid delivery pipe 420 and then flows into the first fluid delivery pipe 410.

In the powder-spreading 3D printer provided by this embodiment, by providing the rotary joints 500 between the first fluid delivery pipe 410 and the second fluid delivery pipe 420, and between the second fluid delivery pipe 420 and the third fluid delivery pipe 430, by providing the rotary joints 500 including the fixed shaft 510 and the sliding sleeve 520, by providing the flow guide hole 511 on the fixed shaft 510, and by providing the sliding sleeve hole 521 on the sliding sleeve 520, stable and continuous transmission of the fluid from the fluid tank 100 to the spray head 300 is achieved; meanwhile, the first fluid delivery tube 410, the second fluid delivery tube 420, and the third fluid delivery tube 430 can facilitate adjustment of the lines of fluid delivery by sliding the head frame 200 on the printer body by the action of the rotary joint 500.

Further, a pump 610 is disposed between the third fluid delivery tube 430 and the fluid cartridge 100 to power the flow of fluid in the fluid cartridge 100 to the third fluid delivery tube 430; the third fluid delivery pipe 430 is provided therein with a direction change valve 620, the direction change valve 620 is connected to a safety valve 630, the safety valve 630 is connected to the fluid bucket 100, and the safety valve 620 serves to introduce the returned fluid in the third fluid delivery pipe 430 into the fluid bucket 100. Wherein the backflow fluid refers to a fluid flowing back into the fluid bucket 100.

Specifically, as shown in fig. 10, a pump 610 is disposed between the third fluid delivery tube 430 and the fluid drum 100 to facilitate pumping of fluid from the fluid drum 100 into the third fluid delivery tube 430. Wherein the inlet end of the pump 610 is connected to the fluid container 100 and the outlet end of the pump 610 is connected to the third fluid delivery tube 430, so that the fluid in the fluid container 100 is pumped into the third fluid delivery tube 430 for fluid transfer.

The direction valve 620 may include first and second oppositely disposed ports 621, 622 and third and fourth oppositely disposed ports 623, 624, wherein the first and third ports 621, 623 are located at an end of the direction valve 620 facing the pump 610; the outlet end of the pump 610 is fluidly connected to the first port 621 of the reversing valve 620, and the second port 622 of the reversing valve 620 is fluidly connected to the third fluid delivery tube 430. when fluid is delivered from the fluid cartridge 100 to the spray head 300, the fluid flows through the outlet end of the pump 610, the first port 621 of the reversing valve, and the third port 623 of the reversing valve into the third fluid delivery tube 430, and is then delivered from the third fluid delivery tube 430 to the spray head 300. A flow passage is provided between the first port 621 and the third port 623, and only when the pressure of the safety valve 630 reaches a set value, the valve of the safety valve 630 is opened, and fluid can flow into the safety valve through the flow passage between the first port 621 and the third port 623; when the pressure of the safety valve 630 is smaller than the set value, the valve of the safety valve 630 is closed, and the fluid cannot enter the safety valve through the flow passage between the first port 621 and the third port 623.

One end of the safety valve 630 is connected to a third port 623 of the direction valve 620, and the other end of the safety valve 630 is connected to the fluid tank 100 through a tee 640; the fourth port 624 of the direction valve 620 is connected to the inflow bucket 100 through a tee 640. A safety valve 630 is installed at the third port 623 of the direction valve 620, and when the pressure in the fluid delivery pipe between the pump 610 and the spray head 300 rises and reaches a set value of the safety valve 630, the fluid in the fluid delivery pipe can flow into the fluid container 100 through the safety valve 630, so as to avoid a risk caused by the blockage in the fluid delivery pipe.

The direction valve 620 is provided with a valve core, and the valve core can reciprocate between the second port 622 and the fourth port 624, so that the valve core can disconnect the passage of the pump from the second port 622 or disconnect the passage of the pump from the fourth port 624. Alternatively, the pump 610 may be in operation at all times during printing, and thus the on/off between the pump 610 and the ejection head 300 may be controlled by controlling the reciprocating movement of the spool in the direction valve 620. For example, when it is desired to provide fluid to the spray head 300, the valve core moves to the fourth port 624, and disconnects the passage between the pump 610 and the fourth port 624, and connects the passage between the pump 610 and the second port 622, so that the fluid pumped by the pump 610 flows into the spray head 300 through the second port 622; when fluid is not required to be provided into the spray head 300, the valve core of the control direction valve 620 moves to the second port 622, and the channel between the pump 610 and the second port 622 is cut off, so that the fluid pumped by the pump 610 enters the fluid barrel 100 through the fourth port 624 and the tee joint 640. In the printer of the embodiment, the pump is set to be in the working state all the time during printing, and the on-off between the pump 610 and the spray head 300 is changed by controlling the reciprocating motion of the valve core of the reversing valve between the second port 622 and the fourth port 624, so that the control precision can be further improved, and the time required by starting the pump is saved.

When fluid needs to be conveyed into the spray head 300, the pump 610 pumps the fluid in the fluid barrel 100 and conveys the fluid into the reversing valve 620, the fluid flows into the third fluid conveying pipe 430 through the first port 621 and the second port 622 of the reversing valve 620, and the fluid enters the spray head 300 through the second fluid conveying pipe 420 and the first fluid conveying pipe 410; when the delivery of fluid is stopped, pump 610 no longer pumps fluid and fluid in third fluid delivery tube 430 may be discharged through spray head 300; when the fluid barrel 100 contains water, the spray head 100 is moved to the upper part of the recovery cavity along the X direction, and the recovery body arranged on the recovery cavity is slid to the side away from the end wall 832, so that a container can be placed below the spray head 300 to collect the water sprayed by the spray head 300; when the glue solution is filled in the fluid tank 100, the spray head 300 operates in the same manner as above, water is added to the fluid tank 100 to clean the fluid tank 100 and the delivery pipe, and the water in the fluid tank flows out to the container at the lower end of the recovery chamber through the delivery pipe and the spray head.

The powder laying type 3D printer provided by the embodiment is convenient for providing power for the fluid in the fluid barrel 100 to flow into the third fluid delivery pipe 430 by arranging the pump 610 between the third fluid delivery pipe 430 and the fluid barrel 100; by providing the direction change valve 620 in the third fluid delivery pipe 430, and connecting the direction change valve 620 with the safety valve 630, not only can the control of the fluid flow direction be realized, but also the explosion hazard caused by the pipe blockage can be effectively avoided.

Further, the printer main body includes: a support and a power assembly, the power assembly including a first Y-direction belt 710, a second Y-direction belt 720, an X-direction belt 730, a first driving member 740, and a second driving member 750; the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 are arranged on the bracket in parallel; the first Y-direction belt 710 includes opposing first and second ends, and the second Y-direction belt 720 includes opposing third and fourth ends; the first end and the third end are connected through a first rotating shaft 760, the first rotating shaft 760 is connected with the first driving member 740, and the second end and the fourth end are connected through a second rotating shaft 770; two ends of the X-direction belt 730 are respectively mounted on the first Y-direction belt 710 and the second Y-direction belt 720, and the nozzle frame 200 is lapped on the X-direction belt 730, so that the X-direction belt 730 can drive the nozzle frame 200 to move in the Y-direction; the second driving member 750 drives the X-direction belt 730 to move, so that the X-direction belt 730 moves in the X-direction.

Specifically, as shown in fig. 11, the bracket may include a plurality of support bars 810, 4 of the plurality of support bars 810 may be arranged in an up-and-down direction, and another support bar 810 may be transversely supported perpendicular to the four support bars 810, so as to achieve stable support of the 4 support bars 810 and facilitate fixation of other components. Alternatively, 4 of the support rods 810 of the stent may enclose a structure with a rectangular cross section. Wherein the support bar 810 may be a solid bar.

The first Y-direction belt 710 is an annular belt structure including a first end and a second end disposed opposite to each other, and the first end and the second end are respectively connected to the rotation shaft to realize the movement in the Y-direction. The second Y-direction transmission belt 720 is an annular belt-shaped structure, and includes a third end and a fourth end which are oppositely disposed, and the third end and the fourth end are respectively connected to the rotation shaft to realize the movement in the Y-direction.

The first Y-direction belt 710 and the second Y-direction belt 720 are installed on the bracket in parallel, it can be understood that the first Y-direction belt 710 and the second Y-direction belt 720 can be fixed on the upper ends of the support rods 810 by a push rod, and the first Y-direction belt 710 and the second Y-direction belt 720 can be disposed on two long sides of a rectangle surrounded by 4 support rods 810.

The first end and the third end are connected through a first rotating shaft 760, and the first rotating shaft 760 is connected to an output end of the first driving member 740, so that the first driving member 740 drives the first rotating shaft 760 to rotate and drives the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 to rotate around the first rotating shaft 740. The second end and the fourth end are connected by a second rotation shaft 750, and the second rotation shaft 750 is used as a driven member, so as to realize the rotation of the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720.

Alternatively, the first driving member 740 may be a step motor, and the first driving member 740 may be slidably mounted on the supporting rod 810, an output end of the first driving member 740 extends outward perpendicular to a side wall of the supporting rod 810, and a driving belt may be disposed between the output end of the first driving member 740 and the first rotating shaft 760, so that the output end is driven to rotate by the first driving member 740, and the first rotating shaft 760 rotates. Optionally, a guide block may be disposed on the outer shell of the first driving member 740 facing the support rod 810, a guide groove adapted to the guide block may be disposed at a corresponding position of the support rod 810, the guide block is inserted into the guide groove, the guide block is limited in the guide groove by a guide fixing plate, and the guide block can move up and down along the guide groove, so that the first driving member 740 can move up and down relative to the support rod 810, and the cylinder 820 can lift up the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720.

The X-direction belt 730 is an annular belt-shaped structure, and includes a fifth end and a sixth end that are oppositely disposed, a third rotating shaft is installed at the fifth end, a fourth rotating shaft is installed at the sixth end, and the second driving member 750 drives the third rotating shaft to rotate, so that the X-direction belt 730 runs in the X-direction. Alternatively, the second driving member 750 may be a stepping motor.

Wherein, the both ends of X direction drive belt 730 are installed respectively on first Y direction drive belt 710 and second Y direction drive belt 720, and optionally, the both ends of X direction drive belt 730 are installed respectively on first Y direction drive belt 710 and second Y direction drive belt 720 through mounting bracket 780. The mounting frame 780 may include a first mounting plate, a second mounting plate, and a third mounting plate, the second mounting plate and the third mounting plate are respectively disposed at both ends of the first mounting plate, and the second mounting plate and the third mounting plate extend toward a lower end of the first mounting plate, so that the first mounting plate is overlapped on the first Y-direction driving belt 710 or the second Y-direction driving belt 720; the mounting plate through hole matched with the third rotating shaft is formed in the second mounting plate, the third rotating shaft is rotatably mounted on the second mounting plate, the mounting plate through hole matched with the fourth rotating shaft is formed in the third mounting plate, and the fourth rotating shaft is rotatably mounted on the third mounting plate so as to rotate and fix the third rotating shaft and the fourth rotating shaft.

The nozzle holder 200 is mounted on the X-direction belt 730, and optionally, the first mounting plate 210 of the nozzle holder 200 is mounted on the X-direction belt 730, so that the X-direction belt 730 can drive the nozzle holder 200 to move in the X-direction and the Y-direction.

By adopting the powder laying type 3D printer provided by the embodiment, when the nozzle 300 needs to be driven to move in the X direction and the Y direction, the first driving member 740 and the second driving member 750 are opened, the first driving member 740 drives the first rotating shaft 760 to rotate, the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 rotate, and further the X-direction transmission belt 730 with two ends overlapped on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 is driven to move in the Y direction, and the nozzle 300 overlapped on the X-direction transmission belt 730 moves in the Y direction; the second driving member 750 drives the third rotation shaft to rotate, and the X-direction transmission belt 730 rotates to drive the nozzle 300 mounted on the X-direction transmission belt 730 to move along the X-direction.

According to the powder-laying type 3D printer provided by the embodiment, the power assembly comprising the first Y-direction transmission belt 710, the second Y-direction transmission belt 720, the X-direction transmission belt 730, the first driving piece 740 and the second driving piece 750 is arranged, the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 are erected on the support, and the two ends of the X-direction transmission belt 730 are erected on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720, so that the spray head 300 can move in the Y direction and the X direction; meanwhile, the first driving piece and the second driving piece are used as power components, so that the movement accuracy in the X direction and the Y direction can be improved.

Further, the support comprises four support rods 810, the upper ends of the four support rods 810 are provided with telescopic air cylinders 820, two air cylinders 820 are connected with the first rotating shaft 760, and the other two air cylinders 820 are connected with the second rotating shaft 770, so that the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 are driven to move up and down through the air cylinders 820.

Specifically, as shown in fig. 11, the supporting rod 810 may be a rod body with a circular, rectangular or diamond cross section, wherein the supporting rod 810 may be made of 45 # steel or aluminum alloy.

The upper ends of the four support rods 810 are provided with telescopic cylinders 820, wherein the cylinders 820 mainly comprise bases, cylinder barrels, pistons and piston rods, the cylinder barrels are installed at the upper ends of the bases, one ends of the piston rods are connected with the end faces of the pistons, the pistons are arranged in the cylinder barrels, the other ends of the piston rods extend out of the cylinder barrels, and the piston rods can move up and down in the cylinder barrels. The base of the cylinder 820 is connected with the upper end of the support rod 810, optionally, the base of the cylinder 820 may be connected with the upper end of the support rod 810 through a screw thread, for example, a threaded hole is formed in the base, a threaded hole is formed in the corresponding position of the upper end of the support rod 810, and a screw is inserted into the threaded hole of the support rod 810 through the threaded hole of the base, so that the air cylinder 820 and the support rod 810 are fastened and connected.

The piston rod may be provided at an upper end thereof with a mounting through-hole through which the first and second

rotating shafts

760 and 770 are rotatably coupled to the piston rod, respectively. Two of the four cylinders 820 are rotatably connected to the first rotating shaft 760, and the other two cylinders 820 are rotatably connected to the second rotating shaft 770, so that the cylinders 820 drive the first Y-direction belt 710 and the second Y-direction belt 720 to move up and down. Alternatively, an electric push rod may be fixed to the upper end of the support bar 810 instead of the cylinder 820.

By adopting the powder spreading type 3D printer provided by the embodiment, when the nozzle needs to be moved to a certain position, the first driving member 740 and the second driving member 750 are started, the first driving member 740 drives the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 to move in the Y direction, the second driving member 750 drives the X-direction transmission belt to move in the X direction, and further drives the nozzle 300 to move in the Y direction and the X direction respectively at the initial position until the nozzle 300 moves to a target position on a two-dimensional plane, and the nozzle 300 ejects fluid to a printing layer through the nozzle 310; when the spray head 300 needs to be moved to the initial position, the piston rod in the air cylinder 820 moves upwards, so that the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 move upwards, and at the same time, the motors in the first driving member 740 and the second driving member 750 rotate reversely, so that the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 rotate reversely, so that the spray head 300 moves to the initial position, the air cylinder 820 drives the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 to move downwards, and the driving assembly and the spray head 300 complete the reset.

According to the powder spreading type 3D printer provided by the embodiment, the telescopic air cylinders 820 are respectively arranged on the four support rods 101, and the air cylinders 820, the first rotating shaft 760 and the second rotating shaft 770 are rotatably connected, so that the driving assembly can be conveniently reset after moving up and down.

The printing forming part comprises a shell, and the shell is fixed on the bracket; the shell is provided with an inner space, a partition wall 830 is arranged in the inner space, the partition wall 830 divides the inner space of the shell into a molding cavity and a powder storage cavity, and the molding cavity and the powder storage cavity are both provided with lower end openings; the below in shaping chamber, storage powder chamber is provided with electric putter 840 respectively, and electric putter 840's output wears to establish respectively in corresponding lower extreme opening, and electric putter 840's output all is connected with piston plate 850, and piston plate 850 lies in shaping chamber and storage powder chamber respectively to drive piston plate 850 up-and-down motion through electric putter 840.

Specifically, as shown in fig. 12-15, the housing may include oppositely disposed side walls 831 and end walls 832 connecting the side walls, wherein the side walls 831 may be rectangular panels and the end walls 832 may be rectangular panels. An internal space is formed between the side wall 831 and the end wall 832, a partition wall 830 is provided in the internal space, and the partition wall 830 divides the internal space of the housing into a molding cavity and a powder storage cavity, and it can be understood that one side of the partition wall 830 is the molding cavity and the other side of the partition wall 830 is the powder storage cavity.

The housing is fixed on the bracket, optionally, the housing may be fixedly connected to the support rod 810, for example, the side walls 831 of the housing, which are disposed opposite to each other, may be respectively connected to the side walls of the support rod 810 through threads, threaded holes are formed in the side walls 831, threaded holes are formed in corresponding positions of the side walls of the support rod 810, and screws are sequentially inserted into the threaded holes of the side walls 831 and the threaded holes of the support rod 810, so that the housing is fixed on the bracket. Wherein, the upper end and the lower extreme of shell all have the opening, and the up end of shell can be with the up end parallel and level of bracing piece 810.

The molding cavity is the place that the printing takes place, and the lower extreme in molding cavity has the lower extreme opening, and the below in molding cavity is provided with electric putter 840, and electric putter 840's output is worn to establish in the lower extreme opening in molding cavity. The output of the power pushrod 840 is connected to the piston plate 850 through a coupling 860, so that the power pushrod pushes the piston plate 850 up and down in the molding cavity.

Wherein, the piston plate 850 is a plate-shaped structure matched with the cross section of the molding cavity, and the lower end of the piston plate 850 is provided with a reinforcing rib to improve the strength of the piston plate. Optionally, the piston plate 850 may be in sealing engagement with the interior cavity of the molding cavity to prevent leakage of material from the piston plate.

The powder storage cavity is used for storing powder materials to be printed, the lower end of the powder storage cavity is provided with a lower end opening, an electric push rod 840 is arranged below the powder storage cavity, and the output end of the electric push rod 840 penetrates through the lower end opening of the powder storage cavity. The output end of the electric push rod 840 is connected with the piston plate 850 through the coupling 860, so that the electric push rod pushes the piston plate 850 to move up and down in the powder storage chamber.

Wherein, the piston plate 850 is a plate-shaped structure matched with the cross section of the powder storage cavity, and the lower end of the piston plate 850 is provided with a reinforcing rib to improve the strength of the piston plate. Optionally, the piston plate 850 may be in sealing engagement with the interior cavity of the powder storage chamber to prevent leakage of material from the piston plate.

The powder paving type 3D printer that this embodiment provided, cut apart into the die cavity and store up the powder chamber through the inner space of partition wall 830 with the shell, below through at die cavity and storage powder chamber sets up electric putter 840 respectively, through connecting piston plate 303 at electric putter 840's output, be convenient for realize that electric putter 840 drives piston plate 850 and reciprocates, and simultaneously, because electric putter's sensitivity is than higher, accuracy nature when making electric putter promote piston plate 850 and reciprocate is higher, the accuracy nature on each printing layer has been improved, and then the whole printing precision of printer has been improved.

Further, the housing includes oppositely disposed side walls 831 and end walls 832 connecting the side walls, both ends of the side walls 831 protruding out of the end walls 832; the printing and forming part also comprises a recovery body, and the recovery body, a side wall 831 extending out of the end wall 832 and the end wall 832 are enclosed into a recovery cavity with an upper end opened; the recovery body is slidably disposed on the sidewall 831.

Specifically, the recovery body may include a transverse plate and a longitudinal plate, a lower end of the transverse plate being connected to one end of the longitudinal plate, and the transverse plate may be disposed perpendicular to the longitudinal plate. Wherein, on two lateral walls 831 of transverse plate installation, and transverse plate and two lateral walls 831 are sliding connection, for example, be equipped with the slide rail on two lateral walls 831 respectively, and the extending direction of slide rail is on a parallel with transverse plate's extending direction, transverse plate's the corresponding position in both sides towards lateral wall 831 is equipped with the guide way with slide rail complex to in realize relative slip between the two.

The recovery body and the side walls 831 and the end walls 832 extending out of the end walls enclose a recovery chamber with an upper end open so as to facilitate recovery of the printing material. Optionally, two recycling cavities may be formed in this embodiment, and it can be understood that two opposite end walls 832, a side wall 831 extending from each end wall at both ends, and a recycling body are enclosed to form two recycling cavities, so as to further improve the recycling rate of the printing material, and save the cost.

Optionally, the side of the longitudinal panel facing away from end wall 832 may be provided with a pull tab to facilitate pulling the recovery body to slide relative to end wall 832. The handle can be similar to the structure of U-shaped, and the handle can be connected with vertical board through threaded connection's mode, for example, is equipped with the fastening hole on the handle, is equipped with the screw hole on the vertical board, through inserting the screw through the fastening hole and establish the screw hole in, realizes the fixed connection of handle and fastening hole.

The powder-laying type 3D printer that this embodiment provided encloses into upper end open-ended recovery chamber through lateral wall 831, the end wall 832 with retrieving the body and stretching out the end wall, does benefit to the recovery of printing material, practices thrift and prints the cost.

Further, the powder spreading device is arranged on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720; the powder spreading device comprises a powder spreading roller 910 and a scraper 920, and the scraper 920 is positioned on one side of the powder spreading roller 910 facing the forming cavity; the scraper 920 is provided with an arc surface matched with the powder spreading roller 910, and the scraper 920 is rotationally matched with the powder spreading roller 910 through the arc surface.

Specifically, as shown in fig. 17-18, the powder spreading roller 910 may be a cylinder, and optionally, both ends of the powder spreading roller 910 are provided with rotating shafts 911. The cylindricity of the powder roller 910 may be 0.01mm for easy powder spreading, but the cylindricity of the powder roller 910 is not limited thereto and is only exemplified here.

The powder spreading roller 910 is installed on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720, and optionally, the powder spreading roller 910 may be installed on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 through a rotation shaft 911.

Scraper blade 920 includes along the first fixed plate 921 of the axial extension of shop's powder roller, and first fixed plate 921 is equipped with first hem 922 towards the one end of scraper blade 920, and first hem 922 is equipped with and spreads the cambered surface of powder roller complex along the axial extension of shop's powder roller 910 on just first hem 922. Materials such as silica gel or a brush are arranged on the arc surface where the powder spreading roller 910 is contacted with the scraper 920, so that the powder materials are prevented from being adhered due to static electricity on the powder spreading roller 910. Wherein, the both ends of first fixed plate 921 all are equipped with arch 923, and arch 923 can be the column, for example cylinder or prismatic, and arch 923 can be platelike, for example rectangular plate.

The scraper 920 is installed on the first Y-direction belt 710 and the second Y-direction belt 720, and optionally, the scraper 920 may be installed on the first Y-direction belt 710 and the second Y-direction belt 720 by a protrusion 923.

The scraper 920 is located on one side of the powder spreading roller 910 facing the forming cavity, so that when powder is spread, the powder is firstly scraped and then spread, and close connection between adjacent printing layers is realized.

The powder paving type 3D printer provided by the embodiment can scrape off powder materials on the powder paving roller by installing the powder paving device on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720, and setting the powder paving device comprising the powder paving roller 910 and the scraper 920 and setting the cambered surface matched with the powder paving roller 910 on the scraper 920.

Optionally, the powder spreading device further includes a fixing frame 930, the fixing frame 930 is installed on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720, the powder spreading roller 910 is rotatably installed on the fixing frame 930, and the scraper 920 is fixedly connected with the fixing frame 930.

Specifically, there are two fixing frames 930, and the fixing frame 930 may include a first connection plate, two ends of which are respectively turned downward to form a second connection plate and a third connection plate. The fixing frame 930 is provided with a bearing 931, the second connecting plate is provided with a first through hole, the third connecting plate is provided with a second through hole at a corresponding position, and the bearing 931 is fixed on the first connecting plate and the second connecting plate after passing through the first through hole and the second through hole.

One of the two fixing frames 930 is overlapped on the first Y-direction belt 710 via a first connection plate, and the other fixing frame 930 is overlapped on the second Y-direction belt 720 via the first connection plate. One rotating shaft 911 of the powder spreading roller 910 is inserted into a bearing of one of the fixed frames, the other rotating shaft 911 of the powder spreading roller 910 is inserted into a bearing of the other fixed frame, and the output end of the stepping motor 932 is connected with one of the rotating shafts 911 to drive the powder spreading roller 910 to rotate.

One of the bulges 923 of the scraper 920 is in threaded connection with the second connecting plate of one of the fixed frames, and the other bulge 923 of the scraper 920 is in threaded connection with the second connecting plate of the other fixed frame, so as to fix the scraper. Optionally, the protrusion may be a plate or a cylinder, a protrusion through hole is formed in the protrusion, a sidewall through hole is formed in the sidewall of the second connecting plate, and a screw is inserted into the sidewall through hole after passing through the protrusion through hole, so that the scraper 920 is fastened to the fixing frame 930.

According to the powder spreading type 3D printer provided by the embodiment, the fixing frame 930 is arranged on the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720, the powder spreading roller 910 is rotatably arranged on the fixing frame 930, and the scraper 920 is fixedly connected with the fixing frame 930, so that the powder spreading roller 910 and the scraper 920 are fixed conveniently.

Alternatively, as shown in fig. 19 to 21, the scraper includes a first fixing plate 921 extending along the axial direction of the powder spreading roller 910, a first folding edge 922 is provided on a side of the first fixing plate 921 facing the powder spreading roller 910, and a side of the first folding edge 922 facing the powder spreading roller 910 has a curved surface to cooperate with the powder spreading roller 9100; the two ends of the first fixing plate 921 extending along the axial direction of the powder spreading roller 910 are fixed with side plates 924, the side plates 924 extend towards one side away from the powder spreading roller 910, and the lower end faces of the side plates 924 are higher than the arc surface. Specifically, as shown in fig. 17 to 19, the first fixing plate 921 has a plate shape, and the first fixing plate 921 extends in the axial direction of the powder applying roller 910, and alternatively, the length of the extending direction of the first fixing plate 921 may be the same as the axial direction of the powder applying roller 910. One side of the first fixing plate 921 facing the powder spreading roller 910 is provided with a first turning edge 922, and the first turning edge 922 is provided with an arc surface matched with the powder spreading roller 910.

The side plate 924 may be an arc plate having a central angle of 90 degrees, and the arc plate includes two side walls and an outer circumferential side wall, one of the two side walls is fixedly connected to one end of the first fixing plate 921, and the other of the two side walls is perpendicular to the first fixing plate 921. Wherein, be fixed with two curb plates 924 on the first fixed plate 921, two curb plates 924 are located the both ends of first fixed plate 921 respectively, and the curb plate 924 orientation deviates from the one side extension of spreading powder roller 910. The side plate 924 is mainly for preventing the powder material accumulated in front of the scraper from leaking out from the side surface when powder is spread.

The other side wall of the side plate 924 is higher than the first turned edge 922 so that most of the powdered material collects on the side of the first fixing plate 921 facing away from the dusting roller 910 and a small portion of the powdered material collects under the blade to achieve normal printing of the printed layer. Meanwhile, since the upper end surface of the side wall 831 is higher than the lower end surface of the first fixing plate 921, the side wall 831 can prevent leakage of the powder material.

Adopt the powder formula 3D printer of spreading that this embodiment provided, before printing, spread powder roller, scraper blade and X direction drive belt 730 and be located initial position, at this moment, spread powder roller and scraper blade and be located the upper end that stores up the powder chamber, X direction drive belt 730 is located one side that spreads the powder roller and deviate from the shaping chamber. When printing is needed, the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 rotate and drive the powder spreading roller, the scraper and the X-direction transmission belt 730 which are arranged on the first Y-direction transmission belt to move towards one side of the forming cavity, the electric push rod 840 in the powder storage cavity pushes the piston plate 850 to move upwards, the electric push rod 840 in the forming cavity pushes the piston plate 850 to move upwards, the scraper scrapes the powder material in the powder storage cavity to the upper end of the forming cavity, the powder spreading roller scrapes the powder material at the upper end of the forming cavity to spread the powder material firmly, the spray head which is arranged on the X-direction transmission belt 730 sprays fluid to the printing layer which is spread firmly by the powder spreading roller, and after the liquid spraying is finished, the first printing layer is printed completely; the cylinder on the supporting rod 810 pushes the first rotating shaft and the second rotating shaft to move upwards, the first driving piece and the second driving piece reversely rotate to enable the first Y-direction transmission belt 710 and the second Y-direction transmission belt 720 to reversely rotate to the initial positions, the electric push rod 840 below the forming cavity descends for a printing layer distance, the electric push rod 840 below the powder storage cavity moves upwards for a printing layer distance, and the cylinder moves downwards to print the next printing layer.

The powder formula 3D printer of spreading that this embodiment provided uses through spreading powder roller and scraper blade cooperation, can prevent that the scraper blade from scraping to its deviate from the non-powder spill of spreading powder roller one side and scatter on the printing layer of having spread the reality, simultaneously, on the scraper blade with spread the powder material that powder roller complex cambered surface set up and can strike off the powder material of spreading on the powder roller.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It will be appreciated that although the present disclosure has shown several embodiments, those skilled in the art will appreciate that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. The utility model provides a spread powder formula 3D printer which characterized in that includes: the liquid spraying device comprises a fluid barrel, a sprayer frame and a sprayer, wherein the sprayer frame is slidably mounted on the printer body, the sprayer is mounted on the sprayer frame, an overflowing channel is formed in the sprayer, the overflowing channel is provided with an inlet and an outlet, the inlet is connected with the fluid barrel, and the outlet is provided with a nozzle;

the overflowing channel is movably provided with a blocking part, the blocking part conducts the inlet and the outlet when moving to a first target position relative to the overflowing channel, and the blocking part disconnects the inlet and the outlet when moving to a second target position relative to the overflowing channel;

an elastic piece is arranged on one side, away from the inlet, of the blocking piece and used for pushing the blocking piece in a propping mode so that the blocking piece moves from a first target position to a second target position;

the printer main body includes: the power assembly comprises a first Y-direction transmission belt, a second Y-direction transmission belt, an X-direction transmission belt, a first driving piece and a second driving piece; the first Y-direction transmission belt and the second Y-direction transmission belt are arranged on the bracket in parallel;

the first Y-direction transmission belt comprises a first end and a second end which are opposite, and the second Y-direction transmission belt comprises a third end and a fourth end which are opposite; the first end is connected with the third end through a first rotating shaft, the first rotating shaft is connected with the first driving piece, and the second end is connected with the fourth end through a second rotating shaft; the two ends of the X-direction transmission belt are respectively arranged on the first Y-direction transmission belt and the second Y-direction transmission belt, and the spray head frame is arranged on the X-direction transmission belt in a lapping manner so that the X-direction transmission belt can drive the spray head frame to move in the Y direction;

the second driving piece drives the X-direction transmission belt to move, so that the X-direction transmission belt moves in the X direction.

2. A powder-laying 3D printer as claimed in claim 1, wherein the liquid spray device further comprises: first fluid conveyer pipe, second fluid conveyer pipe and third fluid conveyer pipe, first fluid conveyer pipe with the shower nozzle is connected, third fluid conveyer pipe with the fluid bucket is connected, the both ends of second fluid conveyer pipe respectively with first fluid conveyer pipe, the articulated and intercommunication of third fluid conveyer pipe, so that the shower nozzle can slide on the printer main part.

3. The powder-laying 3D printer of claim 2, wherein the second fluid delivery tube is hinged to the first fluid delivery tube by a swivel;

the rotary joint comprises a fixed shaft, an inner cavity is arranged in the fixed shaft, and a plurality of flow guide holes communicated with the inner cavity are uniformly formed in the fixed shaft;

two sliding sleeves are rotatably sleeved on the fixed shaft, wherein one sliding sleeve is communicated with the second fluid conveying pipe, and the other sliding sleeve is communicated with the first fluid conveying pipe;

the sliding sleeve is provided with a sliding sleeve hole, one of the first fluid conveying pipe and the second fluid conveying pipe is arranged in the sliding sleeve hole, and when the sliding sleeve rotates to the sliding sleeve hole and is communicated with at least one flow guide hole in the fixed shaft, the sliding sleeve is communicated with the fixed shaft.

4. A powder-laying 3D printer as claimed in claim 2, wherein a pump is provided between the third fluid delivery tube and the fluid drum to power the flow of fluid in the fluid drum to the third fluid delivery tube;

a reversing valve is arranged in the third fluid conveying pipe, the reversing valve is connected with a safety valve, the safety valve is connected with the fluid barrel, and the safety valve is used for introducing the return fluid in the third fluid conveying pipe into the fluid barrel.

5. The powder laying type 3D printer according to claim 1, wherein the support comprises four support rods, the upper ends of the four support rods are provided with telescopic air cylinders, two air cylinders of the four support rods are connected with the first rotating shaft, and the other two air cylinders of the four support rods are connected with the second rotating shaft, so that the first Y-direction transmission belt and the second Y-direction transmission belt are driven to move up and down through the air cylinders.

6. The powder-laying 3D printer of claim 1, further comprising a print molding section comprising a housing, the housing being secured to the bracket;

the shell is provided with an inner space, a partition wall is arranged in the inner space, the partition wall divides the inner space of the shell into a forming cavity and a powder storage cavity, and the forming cavity and the powder storage cavity are provided with lower end openings;

the powder storage device is characterized in that electric push rods are arranged below the forming cavity and the powder storage cavity respectively, the output ends of the electric push rods are arranged in corresponding lower end openings in a penetrating mode respectively, piston plates are connected to the output ends of the electric push rods and located in the forming cavity and the powder storage cavity respectively, and the piston plates are driven to move up and down through the electric push rods.

7. A powder-laying 3D printer as claimed in claim 6, wherein the housing comprises oppositely disposed side walls and end walls connecting the side walls, both ends of the side walls extending beyond the end walls; the printing forming part also comprises a recovery body, and the recovery body, the part of the side wall extending out of the end wall and the end wall jointly enclose a recovery cavity with an upper end opening; the recovery body is slidably disposed on the sidewall.

8. A powder laying 3D printer according to claim 6 or 7, further comprising a powder laying device mounted on the first and second Y-direction drive belts; the powder spreading device comprises a powder spreading roller and a scraper, and the scraper is positioned on one side, facing the forming cavity, of the powder spreading roller; the scraper blade be equipped with spread powder roller complex cambered surface, the scraper blade pass through the cambered surface with spread powder roller normal running fit.

9. The powder laying type 3D printer according to claim 8, wherein the powder laying device further comprises a fixing frame, the fixing frame is installed on the first Y-direction transmission belt and the second Y-direction transmission belt, the powder laying roller is rotatably installed on the fixing frame, and the scraper is fixedly connected with the fixing frame;

and/or the scraper comprises a first fixing plate extending along the axial direction of the powder spreading roller, one side of the first fixing plate, facing the powder spreading roller, is provided with a first flanging edge, and one side of the first flanging edge, facing the powder spreading roller, is provided with the cambered surface so as to be matched with the powder spreading roller; the first fixing plate is fixed with the curb plate along spread the both ends of whitewashed roller axial extension, the curb plate is to keeping away from spread the extension of one side of whitewashed roller, just the lower terminal surface of curb plate is higher than the cambered surface.